Will China's 'elevated bus' really work?

The test run of a futuristic elevated bus cruising over the top of cars in China has generated a lot of buzz. But can it really work?

Experts say the massive vehicle faces a raft of challenges, and even if they're overcome it will be many years before any of the country's congested cities adopts the new transportation system.

"This is a unique idea to encourage people to improve the quality of transportation," said Daizong Liu, China transport program director at the World Resources Institute. "But there are many related concerns."

"Safety is the most important," he said. "How would cars drive and turn under the bus? If there is an accident, how would you move passengers and vehicles out from underneath?"

Designed by TEB Technology, the electric bus would straddle a highway over two lanes, allowing cars to pass underneath. It's meant to help China alleviate massive congestion and pollution in its cities.

The technology exists, but experts say fitting such a giant contraption into the urban environment will be tough.

It might mean demolishing old buildings and felling trees in order to lay down track for the vehicle, Liu said. That could make it "more suitable for a newer city that is in the early stages of planning," he added.

The bus stands 4.8 meters high so that cars have room to drive underneath. The current height limit on Chinese roads is 4.5 meters (15 feet), according to state media. And with hundreds of passengers traveling on top, it could be too heavy for the roads.

A spokeswoman for TEB wasn't able to comment Friday on the potential challenges the project faces.

The idea was originally unveiled in China in 2010. But it's not the first time a huge road-straddling vehicle has been proposed, said Peter Newman, professor of sustainability at Australia's Curtin University.

A pair of architects proposed a similar idea for New York City in 1969, he said. The "Landliner" would have run between Washington and Boston, offered a range of entertainment options on board and glided at 200 mph. The concept was featured as the cover story of New York magazine at the time.

The Landliner concept was featured in New York Magazine in 1969.

That idea faded into history. And the jury is still out on whether any city will get its own elevated bus.

"It's a bit early to say if something like this has the chance of being successful," said Scott Cain, chief business officer of Future Cities Catapult, a U.K. network aimed at developing new products and services. "But given the amount of lost productivity and personal frustration from time spent in traffic jams, it's an agenda that city governments and private firms are looking at."